#283A4C
Closest named color: Dark Blue Grey (#1F3B4D). oklch(34.1% 0.039 249), rgb(40, 58, 76).
Aa
White text reads best on this color (11.66:1).
About this color
#283A4C is a dark, muted blue. In OKLCH its lightness is 34%, its chroma 0.039 and its hue 249°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Blue Grey (#1F3B4D), ΔE 0.011 away. White text reads best on it, at 11.66:1.
| Hue family | Blues |
| Lightness | dark (34%) |
| Chroma | muted (0.039) |
| Temperature | cool |
| Nearest name | Dark Blue Grey (#1F3B4D) |
| Black text | 1.79:1 |
| White text | 11.66:1 |
Values
| HEX | #283A4C |
| RGB | rgb(40, 58, 76) |
| HSL | hsl(210, 31%, 23%) |
| OKLCH | oklch(34.1% 0.039 249) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #283A4C | 11.66:1 | AAA | Lc -100.4 | Preferred for body text |
| Black text on #283A4C | 1.79:1 | Fails | Lc 0.0 | Not readable |
| #283A4C text on white | 11.66:1 | AAA | Lc 96.8 | Preferred for body text |
| #283A4C text on black | 1.79:1 | Fails | Lc 0.0 | Not readable |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 900.
-
Step 50
50
#F3F6F8
oklch(97.1% 0.004 236.5)
-
Step 100
100
#E6EAEF
oklch(93.5% 0.008 253.9)
-
Step 200
200
#D1DAE4
oklch(88.4% 0.017 250.9)
-
Step 300
300
#B2C3D3
oklch(80.9% 0.029 246.5)
-
Step 400
400
#8AA4BD
oklch(70.8% 0.047 247.5)
-
Step 500
500
#6D8DAD
oklch(63.1% 0.06 248.8)
-
Step 600
600
#557799
oklch(55.7% 0.066 249.1)
-
Step 700
700
#456482
oklch(49.2% 0.061 248.3)
-
Step 800
800
#39516A
oklch(42.6% 0.051 250.1)
-
Step 900
900 (this color)
#283A4C
oklch(34.1% 0.039 249)
-
Step 950
950
#1D2832
oklch(27.1% 0.024 246.3)
#283A4C with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #333A4D | 0.016 |
| Deuteranopia (no green cones) | #2E374C | 0.012 |
| Tritanopia (no blue cones) | #1A3E40 | 0.034 |
| Achromatopsia (no color) | #383838 | 0.039 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #283A4C
#283A4C
oklch(34.1% 0.039 249)
- #463521
#463521
oklch(34.3% 0.04 70.4)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #283A4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Blue Grey #1F3B4D ΔE 0.011
- Onyx #343A40 ΔE 0.026
- Gunmetal #293241 ΔE 0.028
- Midnight Green #073B4C ΔE 0.030
- Prussian Blue #1D3557 ΔE 0.032
- Charcoal #264653 ΔE 0.038
- Dark Grey Blue #29465B ΔE 0.042
- Space Cadet #2B2D42 ΔE 0.042
Use #283A4C in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.